diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index f1acdf3..4936c53 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -1874,5 +1874,43 @@
   unlet g:result
 enddef
 
+" The following test used to crash Vim (Github issue #12676)
+def Test_extends_method_crashes_vim()
+  var lines =<< trim END
+    vim9script
+
+    class Observer
+    endclass
+
+    class Property
+      this.value: any
+
+      def Set(v: any)
+        if v != this.value
+          this.value = v
+        endif
+      enddef
+
+      def Register(observer: Observer)
+      enddef
+    endclass
+
+    class Bool extends Property
+      this.value: bool
+    endclass
+
+    def Observe(obj: Property, who: Observer)
+      obj.Register(who)
+    enddef
+
+    var p = Bool.new(false)
+    var myObserver = Observer.new()
+
+    Observe(p, myObserver)
+
+    p.Set(true)
+  END
+  v9.CheckScriptSuccess(lines)
+enddef
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker